The Sealy(R) StableSupport Foundation has been engineered to provide the ideal surface for Sealy(R) mattresses. The solid, flat construction ensures that your bed will maintain its comfort and support for years to come, while a high-quality navy fabric complements the overall aesthetics of every Sealy(R) mattress. The Sealy(R) StableSupport Foundation also offers two distinct height options. A 9" height matches a traditional box spring, and a lower 5" profile creates a modern look that can easily fit through narrow stairways.